diff --git a/pyproject.toml b/pyproject.toml
index 5ccdba719..27e80d7f2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ dev = [
 ]
 test = [
   "pytest ==7.*",
-  "pytest-doctestplus >= 0.9",
+  "pytest-doctestplus ==1.*",
   "pytest-cov >= 2.12",
   "coverage >= 5",
   "hypothesis >= 6",